diff --git a/pyproject.toml b/pyproject.toml
index 9f245f3ab7..482dd342f7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,6 @@ test-command = [
 BOOST_BUILD_PATH = "/tmp/boost/tools/build"
 BOOST_ROOT = "/tmp/boost"
 BOOST_VERSION = "1.81.0"
-MACOSX_DEPLOYMENT_TARGET = "10.9" # required for full C++11 support
 PATH = "/tmp/boost:$PATH"
 
 [[tool.cibuildwheel.overrides]]